Opamp front end examples - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 26th December 2006, 12:24 PM   #1
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
Default Opamp front end examples

Hi,

Just bored and pondering over power amps that use opamps in their front end instead of a discrete LTP. Anyone got any links to schematics of other amps like this?

So far, i've looked at the MF B1 and the Arcam DiVA A90 amplifier.
  Reply With Quote
Old 26th December 2006, 01:05 PM   #2
RSK is offline RSK  Malaysia
diyAudio Member
 
Join Date: Nov 2004
Location: K.L.
Default OPA134 front end

Try white noise audio. I have the MOS125 circuits and they sound good.

Cheers,

RSK.
  Reply With Quote
Old 26th December 2006, 01:20 PM   #3
latala is offline latala  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: staffordshire
try also bgw /amcron/ phase linear /musical fidelity
thee are loads of them out there!
regards trev
  Reply With Quote
Old 26th December 2006, 04:40 PM   #4
ash_dac is offline ash_dac  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: UK
Default Re: Opamp front end examples

Quote:
Originally posted by jaycee
Hi,

Just bored and pondering over power amps that use opamps in their front end instead of a discrete LTP. Anyone got any links to schematics of other amps like this?

So far, i've looked at the MF B1 and the Arcam DiVA A90 amplifier.
Rega Brio thread. But you posted on that thread

Rega Brio (one channel dead)
  Reply With Quote
Old 9th February 2007, 12:54 AM   #5
Lenin is offline Lenin  United Kingdom
diyAudio Member
 
Join Date: Feb 2002
Location: London
Default Musical Fidelity Worth a look...

Mmmmm.....

Look at the MF schematics (particularly for the P170, P270, P370, P470). The DO use a LM318 op-amp front ends, but the internal long-tailed pair is disabled, allowing the use of an all discrete version.

Errrr... I guess that is kinda the exact reverse of what you are after (semi-discrete rather than op-amp only front end) but worth a look...

By the way, no-one on this forum has yet been able to work out how to utilise other opamps in that particular MF topology. (Much to my frustration........!)
  Reply With Quote
Old 9th February 2007, 06:30 PM   #6
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
the British J.E.Sugden P128 uses 5534 as a times 2 gain stage at the front end. It is outside the global NFB.
Sugden P128
__________________
regards Andrew T.
  Reply With Quote
Old 10th February 2007, 01:59 AM   #7
jcx is offline jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
http://www.qscaudio.com/support/libr...ies/rmx850.pdf

ne5532 and floating ouput supplies
  Reply With Quote
Old 10th February 2007, 02:54 PM   #8
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: cambridge ma
The Sumo-9 used two LF353's in the in-amp configuration. Kind of a cute circuit, and the patent's expired.
__________________
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed all-important."
  Reply With Quote
Old 10th February 2007, 10:42 PM   #9
AKN is offline AKN  Sweden
No snake oil
diyAudio Member
 
AKN's Avatar
 
Join Date: Aug 2005
Location: In the middle of Sweden
Send a message via MSN to AKN
hi,

Lets not forget Jan Dupont and his "LYNX" poweramp.
http://www.audio-circuit.dk/LYNX_main.html
Further developed into PA-34 II
http://www.delta-audio.com/PA-34A.htm
__________________
/ Anders
  Reply With Quote
Old 10th February 2007, 11:18 PM   #10
diyAudio Member
 
sixtek's Avatar
 
Join Date: Jan 2007
Quote:
Originally posted by 4fun
hi,

Lets not forget Jan Dupont and his "LYNX" poweramp.
http://www.audio-circuit.dk/LYNX_main.html
Further developed into PA-34 II
http://www.delta-audio.com/PA-34A.htm

Hmmm... These are reminding me the Phase Linear model 300.
The same circuit with modern devices.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Power supplies examples maverick_123 Class D 2 20th November 2007 03:08 PM
Regulated Supply Examples Mike, K8LH Chip Amps 4 28th December 2005 12:04 AM
examples of crown BCA topology jez Class D 2 30th September 2005 10:10 AM
Examples of DIY motional feedback? Mr Evil Multi-Way 10 21st November 2004 06:20 PM
Examples of finished 6-ch GC's? faithblinded Chip Amps 5 14th November 2004 09:20 AM


New To Site? Need Help?

All times are GMT. The time now is 11:23 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2